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Cera is a "Primal Champion" and must be summoned with 3 Shan'ze Ritual Stone at one of her two unique Primal Ritual Stones. The first Primal Ritual Stone is located at 35.7, 63.8, very close to the Alliance-only Violet Rise. The other Primal Ritual Stone is located at 33.2, 45.6, very close to the Horde-only Dawnseeker Promontory. Since Cera is the only summonable boss on the Isle of Thunder that is able to be summoned from two different locations, Blizzard presumably duplicated the stone for faction convenience purposes.

Side Note: Cera is almost certainly a reference to the Triceratops of the same name in the movie series The Land Before Time.